Engineering Research Equipment Grant: Excimer Pumped Dye Laser for Tomographic 3-D Imager

这是一项用于准分子泵浦染料激光层析三维成像系统的研究设备补助金，该系统能够以每秒1000帧的速度制作流体流动的时间分辨率三维图像。该设备将继续开发一种成像系统，用于使用全息干涉计量术检查同向流动的气体射流。图像信息被记录在摄影胶片上，表示与介质的折射率相关的光程长度。层析成像仪与准分子泵浦的染料激光相耦合，开启了令人兴奋的新应用。通过将紫外线辐射调谐到感兴趣物种的共振线上，只会测量到该气体。因此，有选择地测量燃烧流动中的O2或OH等物种应该是可能的。此外，通过沿探测光束的路径长度测量吸收，可以避免繁琐的条纹读出过程。事实证明，这种设备在流体力学和燃烧研究中非常有用。

This is a Research Equipment Grant for an excimer pumped dye laser tomographic 3-D imaging system capable of making time-resolved 3-D images of a fluid flow at a rate of 1000 frames per second. This equipment will continue the development of an imaging system for the examination of a coflowing gaseous jet using holographic interferometry. Image information is recorded on photographic film, representing the optical pathlength, which is related to the index of refraction of the medium. The tomographic imager coupled to an excimer pumped dye laser opens exciting new applications. By tuning the UV radiation to a resonance line of a species of interest, only that gas will be measured. Thus it should be possible to selectively measure such species as O2 or OH in a combusting flow. In addition, by making a measurement of absorption along the path length of the probe beams, the cumbersome process of fringe readout can be avoided. This equipment should prove very useful in fluid mechanics and combustion research.